package common;

import java.lang.management.ClassLoadingMXBean;
import java.lang.management.CompilationMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryManagerMXBean;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;

public class JvmInfo {
	
	static final long MB = 1024 * 1024;  
    
    public static void main(String[] args) {  
          
                  
        //打印系统信息  
        System.out.println("===========打印系统信息==========");  
        printOperatingSystemInfo();  
        //打印编译信息  
        System.out.println("===========打印编译信息==========");  
        printCompilationInfo();  
        //打印类加载信息  
        System.out.println("===========打印类加载信息==========");  
        printClassLoadingInfo();  
        //打印运行时信息  
        System.out.println("===========打印运行时信息==========");  
        printRuntimeInfo();  
        //打印内存管理器信息  
        System.out.println("===========打印内存管理器信息==========");  
        printMemoryManagerInfo();  
        //打印垃圾回收信息  
        System.out.println("===========打印垃圾回收信息==========");  
        printGarbageCollectorInfo();  
        //打印vm内存  
        System.out.println("===========打印vm内存信息==========");  
        printMemoryInfo();  
        //打印vm各内存区信息  
        System.out.println("===========打印vm各内存区信息==========");  
        printMemoryPoolInfo();  
        //打印线程信息  
        System.out.println("===========打印线程==========");  
        printThreadInfo();  
          
    }  
      
      
    private static void printOperatingSystemInfo(){  
        OperatingSystemMXBean system = ManagementFactory.getOperatingSystemMXBean();  
        //相当于System.getProperty("os.name").  
        System.out.println("系统名称:"+system.getName());  
        //相当于System.getProperty("os.version").  
        System.out.println("系统版本:"+system.getVersion());  
        //相当于System.getProperty("os.arch").  
        System.out.println("操作系统的架构:"+system.getArch());  
        //相当于 Runtime.availableProcessors()  
        System.out.println("可用的内核数:"+system.getAvailableProcessors());  
          
        if(isSunOsMBean(system)){  
            long totalPhysicalMemory = getLongFromOperatingSystem(system,"getTotalPhysicalMemorySize");  
            long freePhysicalMemory = getLongFromOperatingSystem(system, "getFreePhysicalMemorySize");  
            long usedPhysicalMemorySize =totalPhysicalMemory - freePhysicalMemory;  
              
            System.out.println("总物理内存(M):"+totalPhysicalMemory/MB);  
            System.out.println("已用物理内存(M):"+usedPhysicalMemorySize/MB);  
            System.out.println("剩余物理内存(M):"+freePhysicalMemory/MB);  
              
            long  totalSwapSpaceSize = getLongFromOperatingSystem(system, "getTotalSwapSpaceSize");  
            long freeSwapSpaceSize = getLongFromOperatingSystem(system, "getFreeSwapSpaceSize");  
            long usedSwapSpaceSize = totalSwapSpaceSize - freeSwapSpaceSize;  
              
            System.out.println("总交换空间(M):"+totalSwapSpaceSize/MB);  
            System.out.println("已用交换空间(M):"+usedSwapSpaceSize/MB);  
            System.out.println("剩余交换空间(M):"+freeSwapSpaceSize/MB);  
        }  
    }  
      
    private static long getLongFromOperatingSystem(OperatingSystemMXBean operatingSystem, String methodName) {  
        try {  
            final Method method = operatingSystem.getClass().getMethod(methodName,  
                    (Class<?>[]) null);  
            method.setAccessible(true);  
            return (Long) method.invoke(operatingSystem, (Object[]) null);  
        } catch (final InvocationTargetException e) {  
            if (e.getCause() instanceof Error) {  
                throw (Error) e.getCause();  
            } else if (e.getCause() instanceof RuntimeException) {  
                throw (RuntimeException) e.getCause();  
            }  
            throw new IllegalStateException(e.getCause());  
        } catch (final NoSuchMethodException e) {  
            throw new IllegalArgumentException(e);  
        } catch (final IllegalAccessException e) {  
            throw new IllegalStateException(e);  
        }  
    }  
  
    private static void printCompilationInfo(){  
        CompilationMXBean compilation = ManagementFactory.getCompilationMXBean();  
        System.out.println("JIT编译器名称："+compilation.getName());  
        //判断jvm是否支持编译时间的监控  
        if(compilation.isCompilationTimeMonitoringSupported()){  
            System.out.println("总编译时间："+compilation.getTotalCompilationTime()+"秒");  
        }  
    }  
      
    private static void printClassLoadingInfo(){  
        ClassLoadingMXBean classLoad= ManagementFactory.getClassLoadingMXBean();  
        System.out.println("已加载类总数："+classLoad.getTotalLoadedClassCount());  
        System.out.println("已加载当前类："+classLoad.getLoadedClassCount());  
        System.out.println("已卸载类总数："+classLoad.getUnloadedClassCount());  
          
    }  
      
    private static void printRuntimeInfo(){  
        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();  
        System.out.println("进程PID="+runtime.getName().split("@")[0]);  
        System.out.println("jvm规范名称:"+runtime.getSpecName());  
        System.out.println("jvm规范运营商:"+runtime.getSpecVendor());  
        System.out.println("jvm规范版本:"+runtime.getSpecVersion());  
        //返回虚拟机在毫秒内的开始时间。该方法返回了虚拟机启动时的近似时间  
        System.out.println("jvm启动时间（毫秒）:"+runtime.getStartTime());  
        //相当于System.getProperties  
        System.out.println("获取System.properties:"+runtime.getSystemProperties());  
        System.out.println("jvm正常运行时间（毫秒）:"+runtime.getUptime());  
        //相当于System.getProperty("java.vm.name").  
        System.out.println("jvm名称:"+runtime.getVmName());  
        //相当于System.getProperty("java.vm.vendor").  
        System.out.println("jvm运营商:"+runtime.getVmVendor());  
        //相当于System.getProperty("java.vm.version").  
        System.out.println("jvm实现版本:"+runtime.getVmVersion());  
        List<String> args = runtime.getInputArguments();  
        if(args != null && !args.isEmpty()){  
            System.out.println("vm参数:");  
            for(String arg : args){  
                System.out.println(arg);  
            }  
        }  
        System.out.println("类路径:"+runtime.getClassPath());  
        System.out.println("引导类路径:"+runtime.getBootClassPath());  
        System.out.println("库路径:"+runtime.getLibraryPath());  
    }  
      
    private static void printMemoryManagerInfo(){  
        List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();  
        if(managers != null && !managers.isEmpty()){  
            for(MemoryManagerMXBean manager : managers){  
                System.out.println("vm内存管理器：名称="+manager.getName()+",管理的内存区="  
            +Arrays.deepToString(manager.getMemoryPoolNames())+",ObjectName="+manager.getObjectName());  
            }  
        }  
    }  
      
    private static void printGarbageCollectorInfo(){  
        List<GarbageCollectorMXBean> garbages = ManagementFactory.getGarbageCollectorMXBeans();  
        for(GarbageCollectorMXBean garbage : garbages){  
            System.out.println("垃圾收集器：名称="+garbage.getName()+",收集="+garbage.getCollectionCount()+",总花费时间="  
        +garbage.getCollectionTime()+",内存区名称="+Arrays.deepToString(garbage.getMemoryPoolNames()));  
        }  
    }  
      
    private static void printMemoryInfo(){  
        MemoryMXBean memory = ManagementFactory.getMemoryMXBean();  
        MemoryUsage headMemory = memory.getHeapMemoryUsage();  
        System.out.println("head堆:");  
        System.out.println("\t初始(M):"+headMemory.getInit()/MB);  
        System.out.println("\t最大(上限)(M):"+headMemory.getMax()/MB);  
        System.out.println("\t当前(已使用)(M):"+headMemory.getUsed()/MB);  
        System.out.println("\t提交的内存(已申请)(M):"+headMemory.getCommitted()/MB);  
        System.out.println("\t使用率:"+headMemory.getUsed()*100/headMemory.getCommitted()+"%");  
          
        System.out.println("non-head非堆:");  
        MemoryUsage nonheadMemory = memory.getNonHeapMemoryUsage();  
        System.out.println("\t初始(M):"+nonheadMemory.getInit()/MB);  
        System.out.println("\t最大(上限)(M):"+nonheadMemory.getMax()/MB);  
        System.out.println("\t当前(已使用)(M):"+nonheadMemory.getUsed()/MB);  
        System.out.println("\t提交的内存(已申请)(M):"+nonheadMemory.getCommitted()/MB);  
        System.out.println("\t使用率:"+nonheadMemory.getUsed()*100/nonheadMemory.getCommitted()+"%");  
    }  
      
    private static void printMemoryPoolInfo(){  
        List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();  
        if(pools != null && !pools.isEmpty()){  
            for(MemoryPoolMXBean pool : pools){  
                //只打印一些各个内存区都有的属性，一些区的特殊属性，可看文档或百度  
                //最大值，初始值，如果没有定义的话，返回-1，所以真正使用时，要注意  
                System.out.println("vm内存区:\n\t名称="+pool.getName()+"\n\t所属内存管理者="+Arrays.deepToString(pool.getMemoryManagerNames())  
                        +"\n\t ObjectName="+pool.getObjectName()+"\n\t初始大小(M)="+pool.getUsage().getInit()/MB  
                        +"\n\t最大(上限)(M)="+pool.getUsage().getMax()/MB  
                        +"\n\t已用大小(M)="+pool.getUsage().getUsed()/MB  
                        +"\n\t已提交(已申请)(M)="+pool.getUsage().getCommitted()/MB  
                        +"\n\t使用率="+(pool.getUsage().getUsed()*100/pool.getUsage().getCommitted())+"%");  
              
            }  
        }  
    }  
      
    private static void printThreadInfo(){  
        ThreadMXBean thread = ManagementFactory.getThreadMXBean();  
        System.out.println("ObjectName="+thread.getObjectName());  
        System.out.println("仍活动的线程总数="+thread.getThreadCount());  
        System.out.println("峰值="+thread.getPeakThreadCount());  
        System.out.println("线程总数（被创建并执行过的线程总数）="+thread.getTotalStartedThreadCount());  
        System.out.println("当初仍活动的守护线程（daemonThread）总数="+thread.getDaemonThreadCount());  
          
        //检查是否有死锁的线程存在  
        long[] deadlockedIds =  thread.findDeadlockedThreads();  
        if(deadlockedIds != null && deadlockedIds.length > 0){  
            ThreadInfo[] deadlockInfos = thread.getThreadInfo(deadlockedIds);  
            System.out.println("死锁线程信息:");  
            System.out.println("\t\t线程名称\t\t状态\t\t");  
            for(ThreadInfo deadlockInfo : deadlockInfos){  
                System.out.println("\t\t"+deadlockInfo.getThreadName()+"\t\t"+deadlockInfo.getThreadState()  
                        +"\t\t"+deadlockInfo.getBlockedTime()+"\t\t"+deadlockInfo.getWaitedTime()  
                        +"\t\t"+deadlockInfo.getStackTrace().toString());  
            }  
        }  
        long[] threadIds = thread.getAllThreadIds();  
        if(threadIds != null && threadIds.length > 0){  
            ThreadInfo[] threadInfos = thread.getThreadInfo(threadIds);  
            System.out.println("所有线程信息:");  
            System.out.println("\t\t线程名称\t\t\t\t\t状态\t\t\t\t\t线程id");  
            for(ThreadInfo threadInfo : threadInfos){  
                System.out.println("\t\t"+threadInfo.getThreadName()+"\t\t\t\t\t"+threadInfo.getThreadState()  
                        +"\t\t\t\t\t"+threadInfo.getThreadId());  
            }  
        }  
          
    }  
      
    private static boolean isSunOsMBean(OperatingSystemMXBean operatingSystem) {  
        final String className = operatingSystem.getClass().getName();  
        return "com.sun.management.OperatingSystem".equals(className)  
                || "com.sun.management.UnixOperatingSystem".equals(className);  
    }  
}
